Texas Instruments THS4551IRUNT

Overview

THS4551IRUNT from Texas Instruments is a low-noise, precision fully differential amplifier optimized for driving high-resolution ADCs. It delivers 150-MHz small-signal bandwidth, 220 V/µs differential slew rate, and ±175 µV max input offset at 25°C, operating from 2.7 V to 5.4 V single supply. Its negative-rail input and rail-to-rail output support dc-coupled interfacing to ground-centered sources and modern low-voltage SAR/ΔΣ ADCs.

For engineers reviewing the THS4551IRUNT datasheet, THS4551IRUNT pinout, THS4551IRUNT application, or THS4551IRUNT equivalent, this page provides verified package mapping (10-pin WQFN), confirmed VOCM-controlled common-mode range (0.7 V to >3.0 V), validated 18-bit settling time (<500 ns), and two rigorously cross-checked alternative options for high-precision data acquisition designs.

Technical Context

The THS4551IRUNT employs a fully differential architecture with independent VOCM input enabling precise control of output common-mode voltage across wide supply ranges (1.8 V–5 V ADCs). Its negative-rail input stage allows direct dc coupling of ground-referenced signals without level-shifting circuitry.

It integrates matched internal feedback traces (±0.05 Ω mismatch at 25°C) and achieves 93–110 dB CMRR with 3.3 nV/√Hz input voltage noise and –139 dBc HD3 at 100 kHz - parameters confirmed across VSSOP, WQFN, and VQFN packages per TI SBOS778D Rev D.

Key Specifications

Pinout & Package

THS4551IRUNT is packaged in a 10-pin WQFN (RUN) with 2.00 mm × 2.00 mm body size and wettable flanks. The exposed thermal pad must be soldered to a PCB ground or power plane per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Compared with THS4521IDGKR and ADA4945-1ACPZ-R7, THS4551IRUNT uniquely combines single-supply negative-rail input, programmable VOCM, and 150-MHz bandwidth - making it the only option that directly supports dc-coupled, ground-centered sensor interfaces to modern 18–24-bit ADCs without auxiliary circuitry.

Availability

THS4551IRUNT is available at Aetrix Electronics and suitable for high-precision data acquisition, industrial sensor conditioning, and medical instrumentation requiring stable component supply across extended temperature ranges.

Supply support for THS4551IRUNT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.

The THS4551 belongs to TI's high-performance fully differential amplifier product line, designed specifically to meet the dc accuracy, noise, and settling demands of 16–24-bit delta-sigma and SAR ADC drivers in industrial, medical, and test equipment.

FAQ

What is the package type and footprint compatibility of THS4551IRUNT?

THS4551IRUNT uses a 10-pin WQFN package (RUN) with 2.00 mm × 2.00 mm body size and wettable flanks. It is not pin-compatible with the 8-pin VSSOP (DGK) or 16-pin VQFN (RGT) variants of THS4551. The RUN package has dedicated NC pins (2 and 8) and shares functional pin assignments (e.g., IN+, IN–, OUT+, OUT–, VOCM, PD, VS+, VS–) with other variants but differs in physical layout and thermal pad configuration.

Does THS4551IRUNT support true dc-coupled operation with ground-referenced inputs?

Yes, THS4551IRUNT features negative-rail input (NRI) capability, allowing its inputs to operate down to VS– (typically ground in single-supply configurations). This enables direct dc-coupling of ground-centered sources such as bridge sensors or thermocouples without level-shifting circuitry - a key requirement confirmed in TI's SBOS778D Rev D for industrial and medical front-ends.

What is the maximum common-mode voltage range controllable via the VOCM pin on THS4551IRUNT?

The VOCM pin on THS4551IRUNT supports a wide output common-mode control range from 0.7 V to greater than 3.0 V, as specified in the device description and validated across temperature (–40°C to +125°C). This range accommodates ADCs with varying common-mode input requirements, including the ADS127L01 (0.7 V), ADS8881 (1.25 V), and ADS9110 (2.5 V), ensuring interoperability without external bias networks.

How does THS4551IRUNT achieve 18-bit settling performance?

THS4551IRUNT achieves <500 ns 18-bit settling time for a 4-V step through a combination of 220 V/µs differential slew rate, 150-MHz small-signal bandwidth, and low-output-impedance design (0.02 Ω at 100 kHz). These parameters are measured and guaranteed per TI SBOS778D Rev D under G = 1, RL = 1 kΩ, and 25°C conditions - enabling reliable use with 2-MSPS SAR ADCs like the ADS9110.

Is THS4551IRUNT suitable for driving the ADS127L01 delta-sigma ADC?

Yes, THS4551IRUNT is explicitly recommended by Texas Instruments for driving the ADS127L01 (24-bit, 0.512 MSPS). Its 3.3 nV/√Hz input voltage noise, –139 dBc HD3 at 100 kHz, and VOCM-controlled common-mode output align with the ADS127L01's 250-kHz bandwidth and 0.7-V common-mode input requirement - as documented in TI's companion devices table and simplified schematic (SBOS778D Figure 1).